Method of treating paper phonograph blanks



Sept. 8, 1931. SCHULZ 1,822,508

METHOD OF TREATING- PAPER PHONOGRAPH BLANKS Filed March 3, 1930 INVENTOR 6 W A'rroRNE'Y Patented Sept. 1931 UNITED STATES PATENTOFFICE EDWIN M. SCI BIULZ, OF NEW YORK, N. Y., ASSIGNOR DURIUM PRODUCTS CORPORA- ITION, OF NEW YORK, N. Y., A. CORPORATTON OF DELAWARE mn'rnon orrnna'rrne PAPER rnonoenarn BLANKS Application filed March 8, 1930. Serial No. 432,923.

I The present invention relates to method and apparatus for correcting, preventing and stopping curling of phonograph records pressed on paper stoc I One type of phonograph records is made by coatin coating'o synthetic resin capable of being hardened by heat. 'The phonograph record.

grooves are formed in the synthetic resinous 1o coating by pressing hot matrix dies forcibly against the coated'surface. This operation hardens the synthetic resin and produces a record grooved surface on one side of the paper stock. In the manufacture of this type of phonograph record, a plurality of re'cordblanks are pressed simultaneously on a single sheet of coated paper. The hardening of the synthetic resin under the action of the heated diescauses adifierential contraction of the coated surface relatively to the body of the aper. This resultsin the coated stock cur ing to such an extent as might interfere with the proper operation of phonograph records, out from the sheet, wh le in use. f

The present invention overcomes the difficulties of the curl in the paper sheet and produces a product which is substantially non-curlin present invention comprises moistening the uncoated side of the paper stock with a liquid such as water, after'thepressing operation has been completed, then, immediately, ironing out the moistened paper stock, preferably by ap lying a hot iron to the uncoated side oi the moistened sheet. After the moistened. stock has been thoroughly ironed dry by a hot iron,the uncoated side of the stock is impregnated with a enetrat ing varnish or lacquer preferably 0 the t e known in the trade as pyroxiylin-varnis Various apparatus may used for-carrying out the present invention but the preferred-form comprises a pai of rolls, one of which is a moistening roll running in a li uid bath, preferably water, that is a apted to .feedthe coated embossed sheet forwardly to; an ironing machine which may comprise a large gas heated. hollow cylinder one side of kraft paper with a.

The pre erred method of carrying out the with suitable pressure rolls around the periphery thereof and arranged in such mannor as to feed the ironed outsheet from the ironer to a pair of rolls for continuing the feed of the sheet and which rolls comprise an applying roll fed from a bath of suitable absorbent lacquer or varnish which is moisture-proof and which impregnates the dry ironed paper so that when the filler varnish is dried the sheet is substantially moistureproof. The sheets so treated are then cut into individual phonograph records which remain substantially fiat without further curling tendencies.

Realizing that the present invention may be embodied and practised in structures and by steps other than those specifically disclosed herewith without departing from the spirit of the invention, it is. desired that the disclosure shall be understood as illustrative and not in the limiting sense.

Fig. 1 is .a view illustrating a pressed sheet of paper coated on oneside with a synthetic resin, which has been embossed with hot dies to form a plurality of phonograph record units on the sheet.

Fig. 2 is a diagrammatic illustration of a preferred form of mechanism for carryingr out the present invention. 1g. 3 illustrates the sheet carrying the multiple phonograph record impressions after it has been through the machine illustrated in Fig. l and processed according to the present invention.

Referring now more especially to the drawings, Fig. .1 illustrates an unprocessed sheet 1 having the upper surface 2 coated with a synthetic resin coating in which phonograph record units 3 have been embossed by heated dies. This Fig. 1 illustrates the tendency of the unprocessed sheet tocurl and warp after the stamping operation.

Fig. 2 illustrates a preferred form of apparatus for carrying out the present inventionwhich a paratus comprises an a plicator 'roll 4, w 10h runs in a bath 5 0 water or other suitable liquid. The periphery of this roll 4 is covered with absorbent material 6 to pickup the liquid from the-bath 5 moisture.

of the unprocessed sheet 1. The feed roll 7 retains the sheet 1 in contact with the periphery of the applicator roll in such manner as to insure the back of the unprocessed sheet 1 being thoroughly moistened by the liquid from the bath 5. -A guide 8 directs the moistened sheet into contact with the polished smooth surface 9 of the ironing hol low cylinder 10 and the pressure rolls 11 which comprise padded cylindrical members in contact with the surface 9 ofthe ironing cylinder, direct the sheet around the ironing cylinder 10 and hold the sheet in contact therewith. These pressure rolls are covered with resilient material such as padded cloth to maintain a resilient pressure on the sheet as it travels through the ironing machine with the uncoated' moistened side ofthe. paper in contact with the surface 9 of the ironing cylinder 10. This ironing cylinder is heated and a convenient means of heating the same is a longitudinally extending gas burner 12 which referably is axially mounted in the cy inder. When the sheet has passed in its travel partially around the heated ironing cylinder, the moisturehas been thorougly dried from the sheet and the paper has been ironed flat so that the curl in the sheet has been eliminated. A guide 14: is provided to direct the ironed sheet to the coating apparatus- Which impregnates the dried paper with a water-proof penetrating material. This coating machine may be of any proper type, and for example, may comprise a pick-up roll 15 running in a bath 16 and an adjustable doctor roll 17 adapted to transfer the liquid of the bath 16 to an applying roll 18 which transfers the liquid to the uncoated paper side of the sheet. A feed roll 19 holds the sheet in engagement with the applying roll 18. Preferably, the coating material in the bath 16 is a thin pyroxylin lacquer which uickly penetrates into the paper and ren ers the paper impervious to The heat hardened synthetic resin on the top of the sheet has already rendered' that side impervious to moisture so that the final processed sheet 20 illustrated in Fig. 3 leaves the apparatus flat in form and substantially impervious to moisture. The pyroxylin varnish impregnated in the paper appears to have substantially the same ooeflicient, of expansion and contraction as the heat hardened synthetic resin so that the processed sheet retains its flat condition 'and consequently, the phonograph record units 2 when out from the final sheet likewise retain their substantially fiat condition under varying conditions of humidity and temperature.

Having described my invention, I claim 1. In the manufacture of phonograph records from paper stock coated on one side with finished heat hardened resinous phonograph record impressions, the method of preventing curling comprising softening the paper stock, ironing the softened paper stock, and impregnating the paper stock with moisture-proof material.

2. In the manufacture of phonograph records from heat hardening synthetic resinous coated paper stock, the method of preventing curling comprising moistening the paper stock, ironing the moistened paper stock, and impregnating the ironed paper stock with moisture-proof material.

3. In the manufacture of articles from a paper sheet coated on one side with heat hardened synthetic resin, the method of preventing curling of the paper sheet comrising moistening the sheet with water, ironing the moistened sheet, and impregnating the ironed sheet with moisture-proof material. A e

4. In the manufacture of articles from sheets of paper coated on one side with heat hardened synthetic resin, the method comprising moistening the sheet with water, ironing the moistened sheet to substantially the shape desired, and impregnating the ironed sheet with moisture-proof penetrating varnish.

5. In the manufacture of articles from absorbent sheet material coated' on one side with heathardened synthetic resin, the method of preventing curling comprising moistening the absorbent material with water, ironing the moistening material, and impregnating the ironed material with moisture-proof substance.

6,111 the manufacture of articles from sheets of absorbent material coated on oneside with a heat hardened resin, the method of preventing curling comprising moisten ing the absorbent material Withdrawing the moisture from said material by heat and pressure, and coating the material with a moisture-proof substance.

7, In the manufacture of phonograph records from sheets of absorbent material coated on one side with a heat hardened resin, the method of preventing curling comprising moistening the sheets on one side with water, withdrawing the moisture from the'sheets by heat and pressure, and impregnating the sheets with an absorbent pyroxylin lacquer.

EDI/VIN M. SCHULZ. 

